The author, Zhang Qianfan, a professor at Peking University known for his advocacy of constitutionalism and judicial reform, dismissed any suggestion his writing excessively promoted Western ideas as “utter nonsense”, and said the academic world should not be politicised.

Since taking office in 2012, President Xi Jinping has tightened the Communist Party’s control over society including the legal system and education.

While authorities have not confirmed they ordered the book withdrawn, and no reason for its disappearance has been given, it comes after the government began a sweeping review of teaching materials.

The Ministry of Education in early January launched a nationwide check on the content of all university constitutional law textbooks, according to posts on the Jiangxi and Zhejiang province education ministry websites.

Universities were told the “fact-finding” sweep was of great importance and they must accurately fill in a chart detailing titles and authors of the books they used, with “no omissions”, according to the ministry’s posts.

The campaign drew criticism from some legal academics, which was amplified by a rumour that the sweep was sparked by an accusation from a professor that certain texts were “promoting Western thinking and agitating for a Western system”.

The education ministry did not respond to a faxed request for comment.

Zhang, in an interview published on the WeChat social media platform, rejected any suggestion his texts promoted a “Western” system over alternatives.

“To criticise purely for the sake of it and to shut our nation off to the outside world is closed-minded thinking,” Zhang said.

“Constitutional law, as an academic discipline, should not be politicised,” he said. “Any academic discipline should retain a certain political neutrality.”

“At this time, constitutional law is a ‘sensitive’ topic. As far as I can see there is basically no public discussion. It seems that everyone is scared,” he said.

Zhang’s interview disappeared soon after it was posted, to be replaced by a notice saying the content had broken “relevant laws and regulations”.

Zhang did not respond to an email seeking comment.

Many legal scholars took to social media to voice support for Zhang.

Some posted the foreword from his book, in which he stresses the importance of giving people who have suffered injustices the chance to defend themselves using the constitution.

Some voiced concern that some academics might accuse others of failing to toe the party line.

“The worst part about this incident is that in the current environment, not only are these people not inhibited, but rather they are given a channel, or even rewards,” Zhang Taisu, an associate professor of law at Yale University in the United States, wrote on Weibo, referring to the accusers.